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Nilai a agar fungsi f ( x ) = { 1 − x ( 5 − x ​ − 2 ) ( 3 + x ​ + a ) ​ , untuk x ≥ 1 x untuk x ≤ 1 ​ kontinu di x = 1 adalah ...

Nilai a agar fungsi 

 

kontinu di x = 1 adalah ...

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H. Nufus

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

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Pembahasan

Ingat bahwa limit dikatakan kontinu di x = a jika Maka Jika f(x) maka kontinu x = 1 sehingga,

Ingat bahwa limit dikatakan kontinu di x = a jika

begin mathsize 14px style bold lim with bold x bold rightwards arrow bold a to the power of bold minus below bold f begin bold style left parenthesis x right parenthesis end style bold equals bold lim with bold x bold rightwards arrow bold a to the power of bold plus below bold f begin bold style left parenthesis x right parenthesis end style end style 

Maka

Error converting from MathML to accessible text. 

Jika f(x) maka kontinu x = 1 sehingga,

begin mathsize 14px style limit as straight x rightwards arrow 1 to the power of plus of open parentheses fraction numerator left parenthesis square root of 5 minus straight x end root minus 2 right parenthesis space left parenthesis square root of 3 plus straight x end root plus straight a right parenthesis over denominator 1 minus straight x end fraction close parentheses equals limit as straight x rightwards arrow 1 to the power of minus of limit as straight x rightwards arrow 1 to the power of plus of fraction numerator left parenthesis square root of 5 minus straight x end root minus 2 right parenthesis over denominator 1 minus straight x end fraction limit as straight x rightwards arrow 1 to the power of plus of left parenthesis square root of 3 plus straight x end root plus straight a right parenthesis equals 1 limit as straight x rightwards arrow 1 to the power of plus of fraction numerator left parenthesis square root of 5 minus straight x end root minus 2 right parenthesis over denominator 1 minus straight x end fraction open parentheses fraction numerator square root of 5 minus straight x end root plus 2 over denominator square root of 5 minus straight x end root plus 2 end fraction close parentheses limit as straight x rightwards arrow 1 to the power of plus of left parenthesis square root of 3 plus straight x end root plus straight a right parenthesis equals 1 limit as straight x rightwards arrow 1 to the power of plus of fraction numerator left parenthesis 5 minus straight x minus 4 right parenthesis over denominator 1 minus straight x end fraction space fraction numerator 1 over denominator square root of 5 minus straight x end root plus 2 end fraction left parenthesis square root of 3 plus straight x end root plus straight a right parenthesis equals 1 limit as straight x rightwards arrow 1 to the power of plus of open parentheses fraction numerator 1 minus straight x over denominator 1 minus straight x end fraction close parentheses space fraction numerator 1 over denominator square root of 5 minus straight x end root plus 2 end fraction open parentheses 2 plus straight a close parentheses equals 1 fraction numerator 1 over denominator square root of 5 minus straight x end root plus 2 end fraction open parentheses 2 plus straight a close parentheses equals 1 fraction numerator 2 plus straight a over denominator 4 end fraction equals 1 2 plus straight a equals 4 straight a equals 2 end style 

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